Eleotkioal



(No Model.)

L. DE'CKARD. ELEGTRIOAL APPLIANCE FORDYENTAL CHAIRS. No. 353,403.Patented Nov. 30, 1886.

Horneys.

UNITED STATES PATENT OFFICE.

LEVI LNDEOKARD, OF.MIDDLETOWVN, PENNSYLVANIA.

ELECTRICAL APPLIANCE FOR DENTAL CHAIRS.

SPECIFICATION forming part of'Lettera Patent No. 353,403, dated November30, 1886. 7

. Application filed August 24, 1886.

To. all whom it may concern:

Be it known that I, LEVI L. DEOKARD, a citizen of the United States,residing at Middletown, in the county of Dauphin and State ofPennsylvania, have invented certain new and useful Improvements inElectrical Appliances for Dental Chairs; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to an electrical apparatus and its application todental chairs, and has for its object the administration of elec tricityas an antesthetic to persons in an operating-chair preparatory to orcoincident with the extracting of teeth, or performing other dentaloperations more or less painful in their nature.

The invention will be hereinafter described, and particularly pointedoutin the claims.

In the accompanying drawings,which form a part of this specification,Figure 1 is a perspective view of a dental chair provided with myelectrical attachment ready for operation; Fig. 2, a side view of themagneto electric machine; and Fig. 3, an end View of same, looking inthe direction of the arrow in Fig. 2.

Reference being had to the drawings and letters marked thereon, Arepresents a dental chair of ordinary construction.

B is a portable stand incasing and supportinga magneto-electric machinefor supplying electricity to the electrodes at a through the medium ofinsulated circuit-wires b b, which encircle the arms of the chair A.

C is a right or left foot pedal for controlling the flow and intensityof electricity.

D is a frame in which is placed the mechanism for creating electricity,as will hereinafter be described.

E is a horseshoe-magnet suspended from the upper left-hand corner offrame D, and secured in position at c by a crossbar, d, having aninsulating substance, e-such as guttapercha, glass, or othernon-conducting materialinterposed between said bar d and magnet E, forthe purpose of confining the magnetic current to the magnet.

F, G, and H are shafts supported in frame D. Shaft F carries on one enda drum, f, incasing a power-spring, (not shown,) on its 0p Serial No.211,734. (No model.)

magnet E, traveling in a direction at right' angles thereto andpropelled through the medium of pulley Z on said shaftH and a belt orcord, m, connecting said pulley with pulley j above.

J is a brakeshoe, pivoted at a, which, in its normal condition, pressesagainst one side of .pulleyj and prevents the machine from runn1ng..

K is a brake-rod, pivoted to the shoe J at 0, and securely fastened atits lower end to a cross-bar, L, which bar is pivoted to the oppositeside of frame D at p, to allow of a perpendicular movement of thebrake-rod K, for the purpose of applying the brake. Permanently securedto bar L is a rod, M, encircled by a spiral spring, N, the lower end ofwhich rests upon the stand, as shown in Fig. 1, and exerts itself in anupward direction against crossbar L, brake-rod K, and brakeshoe J,thereby holding the latter in frictional contact with pulleyj untilreleased by pressure upon the pedal C, secured to rod M at g, whichcompresses the spring N, and allows the bar L, rod K, and shoe J to fallby gravity.

The pedal 0 is provided with an elongated slot, r,in both ends thereof,and holes 8 through the same at right angles thereto. Two of the legs onopposite sides of stand B are provided with similar holes, it, throughwhich holes 8 and t a pin, a, is inserted, to form a fulcrum for saidpedal and to bind it and one leg together, as shown. From thisconstruction it is obvious that the pedal may be made to operate withthe right or left foot by simply placing the pin a in one end or theother, as the case may demand.

The spring incased in drum f having been wound by the aid of crank g,applied to the opposite end of shaft F, and the braking mechanism havingbeen released by pressare of the foot upon pedal C, said powerspringexerts itself upon the electromagnet I through the medium ofmaster-wheel h, pinion 2, pulleys j Z, and cord or belt m, thusproducing a current of electricity, as before described, which passesfrom the bindingpost k, through the circuit-wires b b, to the electrodesa a, and thence through the body of the patient in the chair, who havinggrasped the electrodes, one in either hand, the circuit is completed andthe desired shock is produced.

Having thus fully described my invention, what I claim is 1. In amagneto-electric machine, an automatic driving mechanism, a revolvingdisk, and a brake shoe in operative contact therewith, in combinationwith rods, and a pedal having an elongated slot or slots, and guidestherefor, substantially as described.

2. A magneto-electric machine having an automatic driving mechanismincased in and supported upon aportable stand, a pedal having anelongated slot or slots therein and I mounted upon opposite legs of thestand, pins for securing either end of the pedal to said legs, and abrakerod secured to its center, said rod passing through the center ofthe stand and encircled by a spring pressing against the frame and thestand, in combination with circuit Wire's terminating in electrodes,substantially as described.

3. A magneto-electric machine having an automatic driving mechanismsupported upon aportable-stand, a brake mechanism connected with a pedalattached to said stand, and insulated wires, in combination with achair, the arms of which are encircled by said wires, terminating inelectrodes placed in a convenient position for a patient to hold,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

LEVI L. DEOKARD.

IVitnesses:

J OHN S. CRoLL, WM. A. CRoLL.

